Gas burner



.sep1.11,19z3. 1,467,472

L. w. BUBB GAS BURNER l "Filed Nov. 2s, 1921 2 sheets-sheet 1 sept. 11, 1923.

L. W. BUBB GAS BURNER 2 Sheets-Shee-t 2 Filed Nov. 2a, 1921 NN ww N K Hlnlfkl. a

Patented Sept. 11, 1923.

UNITED `STf-ITESy 'PATENT ortica.

LEWIS W. BUBB, 0F ST. LOUIS, MISSOURL'ASSIGNOR TO JESSE'M. `I'lILLLJvIS, 01E'.

WEBSTER GROVES, MISSOURI.

ses iURNER.

l ppiication mea November as, 1921. serial No; 518,236. l

To @ZZ wlw/m, t may concern.' y l Be it known that I, LEW1s W. BUBB, a .citizen of the United States of America, a resident of the city of St. Louisand State of Missouri, have invented certain new and useful Improvements in Gas Burners, of which the following is a full, clear, and eX- act description, reference being had to the accompanying drawings, forming a part of this specication. j y l This invention relates to improvements in gas burners, the main object being to produce a gas burner whereby the gas is most effectively mixed with primary and secondary air. More' specifically stated, an object is to facilitate the delivery of secondary air to discharge openings in the burner. A further object is to very effectively mix the primary air with the gas passing into the burner. f

With the foregoing and other objects in view, the invention comprises the novel construction, combination and arrangement of parts hereinafter more specifically described and illustrated in the accompanying drawings wherein is shown the preferred emA bodiment of the invention. l However, it is to be understood that the invention comprehends changes, variations and modications hereunto appended, g

Fig. I is a vertical section illustratingthe lower portion of a boiler equipped with a gas burner embodying the ,features of this invention.v j

Fig. II is a front elevation of' a portion of the boiler, the. front wall of the combustion chamber being removed to show one of the burner supports.

Fig. III is Va view'similar t0 Fig. II with Athe frontV wall, of thecombustion chamber secured to the boiler. i

Fig. IV is a view similar to Figs. II and III, showing the adjustable burner support which closes the vburner-receiving opening in the front wall. v

Fig. V is a transversel section showing the burner in the combustion cha'nribery Fig. VI is a horizontal section taken approximatelyy on the line VI-VI in Fig. IV.

Fig.' VII is a vertical section on the line VII in Fig. IV, .4 1

Fig. VIII is an` enlarged horizontal'section, partly in elevation, showing the burner.

' burner.

Fig. `IX is a section taken approximately on the line IX-IX in VIII, showing' the gas supply pipe which does not appear in Fig. VIII. j j

Fig. X is a transverse section' showing one of the burner tubes.

In the drawings, lI have shown a portion of a sectional boiler including hollow sections l, 2 and 3 having inner faces formed as shown most clearly by Fig. V to provide a combustion chamber 4 having verticalrside faces 5 at opposite sides of a twin'burner B. As shownby Fig. V, the twin burner has inclined side faces located adjacent the vertical faces 5 to provide flaring inlets for secondary' air, and the vburner can be adjusted vertically without varying the width of these inlets To permit vertical adjustment of the burner, the rear wall of the combustion chamber is provided with a vertical row 'of recesses '6.

zontal planes and they provide burner-supporting seats whereby the rear end' of the burner can :be supported iny corresponding vhorizontal planes. which come within the scope of the claims front end of the Vburnercomprises a vertically adjustable closure` plate 8 `adapted to receive the inlet pipe 9 extending from the burner. The front wall of the combustion chamberis provided with a large burnerreceiving opening 10 (Figs.` IV and VII) normally `closed by the vertically adjustablev plate 8. The closure plate 8 is adjustably secured to the front wall of the combustion chamber by means of an upper bolt 1l and lower bolts'l2, said bolts passing through plate 8 and also through said front wall, the latter being provided with vertical'rows of holes 13 (Figs. I, III and IV) adaptedto vreceive said bolts. rI`he boltscan be shifted from` one hole to another to'v support the vVII) and` it supports the front end ofthe4 The burneris provided with integral lugs 14 (Figs. I, VI' and VII) into .which the'bolts 12 are screwed.

Each adjustable closure plate vShasan air inlet controlled by a door 15 (Figs. I, IV

and VII), said door being adjustable to regulate the delivery of secondary air through the opening 10 (Figs. III and VII) which leads into the combustion chamber to supply air at points above the burner. Each door 15 comprises a marginal frame hinged at the top and provided with a fine screen.

16 through which air is admitted when the door is closed. Each burner B comprises a pair of parallel gas-conducting tubes 17, integrally connected together, each ot said tubes having oppositely inclined'flat side faces converging to its flat narrow top face. The tubes 17 `are adjacent to eachother to form a restricted air inlet between them (Fig. V) and the adjacent inclined faces ot' the tubes are extended upwardly from the narrowest portion of said inlet to provide an upwardly Haring air passageway leading to the upper edges of the tubes.

As shown by Figs. VIIIiand X, the upper edge Vof each gas-conducting tube is provided with two longitudinal rows of dischargeopenings 18, the openings in each row being staggered with respect to the openings in the other row. The inclined side faces of each tube 17 yare provided at their upper margins with longitudinal rows of air-conducting grooves 19 terminating at the top face `of the tube, and the upper end ot' each of said'grooves ispreferably formed opposite'v to a discharge opening 18 in one of the rows of openings Vand between two dischargeopenings 18 in the other row.

The secondary air rising at the inclined sidet'aces of the vburner tubes 17 is permittedv to pass through the grooves 19 to the top faces of the tubes at pointsbetween and adjacent to openings 18 from which the gaseous fuelis discharged, `so the secondary air is very efectively delivered to and mixed with the fuel atthe base of each flame.

The .secondary air, is admitted to the lower portion of the combustion chamber through ports 20 (Figs. III, IV and VI)` formed in the front wall ofthe combustion chamber. 21: designatesvertically adjustable closures (Figs- IV and VI) adapted to control the admission ofair at thev ports 20.

A gassupply pipe 22 (Figs. I and IX) ,is connected to .the inlet pipe 9 through the medium f of a return bend R having a substantially U-shaped tapering passageway 23 provided with a:relatively large open intake end 241 for the admission of air and a smaller discharge end 24( leading tothe inlet pipe 9;. Anozzle 25-is screwed into the return bend R so as to extend into the relatively small end portion of the. tapering passageway. The gassupply conductor has an outletpassageway 26 at'thebottOm (Figs. VIII and IX)` leadingtozthenozzle 25. The nozzle-andthe. inlet pipe 9. are in horizontal aliinementy with the relatively small discharge end'Q/l of the tapering passageway 23, and both ends of thisnpassageway lie in the same horizontal plane.

lVhen the burner is in service a stream of gas is discharged from nozzle 25 and a -body ofprimaryl air is drawn into the relatively large intake end 24 of the tapering passagewayf23 and discharged with the gas passing to the inlet pipe 9. A relatively large body of airA can `freely'enter-the large intake end of passageway 23 and this air is gradually compressed in the tapering. passageway as it passes into 'and around the stream of gas issuing from nozzle 25. By admitting the air in thisv manner, I deliver a relativelylarge body of primary air tol the'gas, and this is very desirable, the primary air-commingled with" the gas in the burner being` more effective than the added body of secondary air which enters the iame from points outside of the burner. Moreover, the gas is verythoroughly mixed with `the primary air admitted/through the-tapering U-y shaped passageway 23.

An inexperiencedperson 4should not regulate the admission'o-f primary air to the return bend R, so this regulationis preferably determined. by an expert who arranges a suitable annular lbushing 27V in the relatively large end ofthe tapering Ypassageway 23, said bushing being screwed into t e. return bend so that it can be-removed and l'replaced by another b'ushingii2 further'adjustment is desired..

Since the nozzle25 is v'sup-pliedwith .gas through an outlet26 (Fig. 1X) at the bottom of the gas supplyY conductor, the 4gascontrolling. valve (not shown) can'be conveniently located at'a .point remote Afrom the nozzle', and. in thiseventair will not :come mingle l"with 'theV gas in 'the supply' conductor 22 when the..controlling-'valve isl closed. This is due lto fthe factthatairfwill not rise throughV the `gas outlet .26 at the bottom of the gas conductor. `As^a`consequence', whenever the gas is turned on,4 gas alone will be discharged from'the nozzle25and this tends to prevent aback fire lin lighting the burner.

I claim: j 1. Av gas burner comprising a .pair of parallel 'gasfconducting tubesA integrally connected together andk provided -with discharge openings inl theirl upper. edges each of said tubes having oppositely inclined side faces converging toits upper edge. said tubes being adjacent to each other toi'orm a restricted air inlet between them, andzthe adjacent inclined faces ofsaidtubes being extendedv upwardly' from the'n'arrowest ,portion of said` inlet l-to pro-vide an'y upwardly flaring, air passageway' leadingk to" said upper edges. -Y

2.- A 'gas burner comprising aY pair.' of

parallel gas-conducting tubes. integrally of said tubes having oppositely inclined side faces converging to its upper edge, said tubes being adjacent to each other to form a restricted air inlet between them, the adjacent inclined faces of said tubes being extendedupwardly from the narrowest portion of said inlet to provide an upwardly flaring air passageway leading to said upper edges, and each of said inclined faces being flat and provided at its upper margin with air-conducting grooves terminating at the upper edge of the burner at points adjacent to the discharge openinfrs.

E. A gas burner having an inlet for a mixture of gas and air, and a passageway leading to said inlet, said passageway having an open air intake fo-r the admission of air, a gas-nozzlemounted in said passageway and arranged to discharge gas into said inlet, and a gas conductor having an outlet at the bottom leading to said nozzle, said gas conductor being arranged at an angle relative to said passageway leading to said inlet.

4c. A gas burner comprising a pair of parallel gas conducting tubes integrally' connected together and provided with dis-l said tubes being adjacent to each other to form a restricted air inlet between them,

the adjacent inclined faces of said tubes being extended upwardly from the narrowest portion of said inlet to1 provide an upwardly flaring air passageway leading to said upper edges, each of said `inclined faces being flat and pro-vided at its upper margin with air conducting grooves terminating at the upper edge of the burner at points adjacent to the discharge openings, said tubes being provided with an open end for the admission of air, a gas nozzle mounted in thel passageway through said tubes and arranged to discharge gas into said inlet and a gas conducto-n having an outlet at the bottom leading to said nozzle, said gas conductor being arranged at an angle relative to said passageway in said tubes.

In testimony that I claint the foregoing I hereunto aix my signature.

Lswis w. BUBB. 

